Studies about violance

 Physical violence

Several investigators, including Dr. J.H. Prescott, have suggested that touch deprivation in childhood leads to physical violence. He has that most juvenile delinquents and criminals come from neglectful or abusive parents, and he believes that “the deprivation of body touch, contact and movement are the basic  causes of number of emotional disturbances including depressive and autistic behaviors, hyperactivity, sexual aberration, drug abuse, violence and aggression.”

His theory is that the lack of sensory stimulation in childhood leads to an addiction to sensory stimulation in adulthood, resulting in delinquency, drug use, and crime. This theory came from a study conducted in forty-nine non-industrial cultures from Ainu in Japan to the Zuni in New Mexico. All these cultures were notably similar, except that high rates of adults violence were observed in those cultures where children received very little physical affection, and no adult violence occurred in those with high level of physical affection toward children.

These findings could of course, relate to other things, such as parental sexual abuse, although the study found no cultural differences on this or any other variables. 

PubMed: nccam.nih.gov/